CN110473747B - Circuit breaker and circuit breaker operation identification method - Google Patents
Circuit breaker and circuit breaker operation identification method Download PDFInfo
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- CN110473747B CN110473747B CN201910594504.3A CN201910594504A CN110473747B CN 110473747 B CN110473747 B CN 110473747B CN 201910594504 A CN201910594504 A CN 201910594504A CN 110473747 B CN110473747 B CN 110473747B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/04—Means for indicating condition of the switching device
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/04—Means for indicating condition of the switching device
- H01H2071/044—Monitoring, detection or measuring systems to establish the end of life of the switching device, can also contain other on-line monitoring systems, e.g. for detecting mechanical failures
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention relates to the field of electric appliances, in particular to a circuit breaker and a circuit breaker operation identification method. A circuit breaker, comprising: a contact; a position sensing module: detecting the position of the contact; the current mutual inductance module: detecting a fault current in the circuit; a trip coil: driving the contact to work; the control module is respectively connected with the position sensing module, the current mutual inductance module and the trip coil: and the current transformer module is used for receiving corresponding detection signals fed back by the position sensing module, the current transformer module and the trip coil and feeding back an operation signal of the circuit breaker according to the corresponding detection signals. The method can accurately feed back whether the opening operation information of the circuit breaker is manual opening or fault tripping. The staff can take corresponding counter-measures according to the operation information that feeds back, can carry out remote control switching-on operation, has effectively avoided the emergence of incident, is the very big progress of this field of technology.
Description
Technical Field
The invention relates to the field of electric appliances, in particular to a circuit breaker and a circuit breaker operation identification method.
Background
In a low-voltage distribution system, a circuit breaker is an important protection element, and can realize trip protection when a line has a fault, effectively remove the fault line and protect the safe operation of a power distribution network. Meanwhile, during operation and maintenance, the load can be manually disconnected, and the isolation effect is realized.
At present, the operation and maintenance of a power system, especially the operation and maintenance of the power system, cannot remotely and effectively monitor whether the operation action of the current circuit breaker is caused by a fault or a human factor, so that once the circuit breaker is required to be operated, especially the switching-on operation, the operation of an operator on site is often required to be arranged in consideration of safety, and thus the use basis of manpower is increased. And the control can not be carried out remotely, so that the safety accident caused by remote operation closing can be avoided when the maintenance is carried out after manual brake opening. Therefore, whether the opening and closing of the circuit breaker are manually operated or fault protection actions can be identified, and the safety accidents can be effectively avoided.
Patent application No. 201710969030.7 discloses a method for identifying a mechanical fault of a circuit breaker, but the problem of accurate identification still cannot be solved effectively, and researchers in the field do not perform deep research on the problem of accurate identification of fault circuit breaking or manual operation, which may easily cause a safety accident due to misoperation or waste of a large amount of manpower.
Therefore, the prior art still has the defects, and needs to be improved and innovated by the researchers in the field.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a circuit breaker and a circuit breaker operation identification method, which can accurately identify whether the opening operation of the circuit breaker is artificial or a fault, and further enable a technician to send a command of remote control closing or operation, inspection and maintenance in a determined manner.
In order to achieve the purpose, the invention adopts the following technical scheme:
a circuit breaker, comprising:
a contact;
a position sensing module: detecting the position of the contact;
the current mutual inductance module: detecting a fault current in the circuit;
a trip coil: driving the contact to work;
the control module is respectively connected with the position sensing module, the current mutual inductance module and the trip coil: and the current transformer module is used for receiving corresponding detection signals fed back by the position sensing module, the current transformer module and the trip coil and feeding back an operation signal of the circuit breaker according to the corresponding detection signals.
Preferably, in the circuit breaker, the contacts have operating states including: closing, storing energy and releasing.
The circuit breaker preferably further comprises a magnetic tripping module and a tripping test button, wherein the magnetic tripping module is used for driving the contact to trip when instantaneous large current is detected in the circuit; the tripping experiment button is used for driving the contact; the control module is provided with a manual control unit and is also used for controlling the tripping coil to work.
The circuit breaker preferably further comprises a communication module, and the control module is connected with the server through the communication module; the control module is also used for sending a breaker operation signal to the server and receiving a remote control instruction sent by the server.
Preferably, the circuit breaker, the operation signal comprises: manual operation, fault protection tripping, manual control tripping, tripping test tripping, backup protection tripping and remote control operation.
Preferably, in the circuit breaker, the operation signal specifically includes:
manual operation: the breaker handle is manually operated to realize the opening of the breaker, and the working state of the contact is changed from the closing state to the energy storage state;
fault protection tripping: after the control module receives a fault current signal sent by the current mutual inductance module, the control module drives the contact to change the working state of the contact from the closed state to the tripped state through the tripping coil;
manually controlling the opening operation: the control module is directly operated manually, and the control module drives the working state of the contact to change from the closed state to the tripping position through the tripping coil;
tripping test opening operation: manually operating the tripping test button, wherein the tripping test button drives the working state of the contact to change from the closed state to the tripped state;
backup protection tripping: when the magnetic tripping module detects that instantaneous large current occurs in a circuit, the magnetic tripping module drives the contact to change the working state of the contact from the closed state to the tripping position;
remote control operation: the control module receives a remote control signal of the server, and the control module drives the working state of the contact to change from the closed state to the tripped state through the tripping coil.
A circuit breaker operation recognition method using the circuit breaker, comprising the steps of:
A. the control module receives the contact working state detected by the position sensing module, the fault current signal detected by the current mutual inductance module and the tripping coil driving contact signal;
B. and the control module obtains whether the reason of the circuit breaker tripping is fault tripping or manual operation by a control analysis method according to the received contact working state, the fault current signal and the driving contact signal, and feeds back a corresponding operation signal.
Preferably, in the method for identifying an operation of a circuit breaker, the control analysis method in step B specifically includes:
b1, the control module detects the working state of the contact, and if the working state is energy storage, a manual operation signal is fed back; if the working state is tripping, executing the step B2;
b2, the control module detects whether a tripping coil drives the contact to act, if yes, the step B3 is executed; if not, go to step B5;
b3, the control module detects whether a remote control instruction of the server is received, if yes, a remote control operation signal is fed back; if not, go to step B4;
b4, the control module detects whether a first fault current signal of the current mutual inductance module is received, if yes, a fault protection tripping signal is fed back; if not, feeding back a manual control opening operation signal;
b5, the control module detects whether a second fault current signal of the current mutual inductance module is received, if yes, a backup protection tripping operation is fed back; if not, the tripping test opening operation is fed back.
In the method for identifying the operation of the circuit breaker, step B1 further includes: and if the working state is closed, feeding back a normal working signal.
Preferably, in the method for identifying the operation of the circuit breaker, the object of the control module for feeding back the operation information includes: server, local terminal display screen.
Compared with the prior art, the circuit breaker and the circuit breaker operation identification method provided by the invention have the advantages that the control module can accurately feed back whether the opening operation information of the circuit breaker is manually opened or tripped due to faults according to the position signal of the contact, the fault current signal and the action signal of the trip coil. The staff can take corresponding counter-measures according to the operation information that feeds back, just so can not take corresponding measures when manual operation, also can carry out remote control switching-on operation under other circumstances, effectively avoided the emergence of incident, be the very big progress of this field of technology.
Drawings
Fig. 1 is a flowchart of a circuit breaker operation recognition method provided by the present invention;
FIG. 2 is a logic flow diagram of a method of identification provided by the present invention;
fig. 3 is a block diagram of a circuit breaker according to the present invention;
fig. 4 is a circuit diagram of a circuit breaker provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Please refer to fig. 1-4 together. The module numbers in the figures: the device comprises a contact, a control module 10, a manual control unit 11, a position sensing module 20, a current mutual induction module 30, a trip coil 40, a magnetic trip module 50, a trip test button 60 and a communication module 70.
Example 1
The invention provides a circuit breaker operation identification method, which comprises the following steps:
s10, the control module 10 receives the contact position signal detected by the position sensing module 20, the fault current signal detected by the current transformer module 30, and the feedback signal of the trip coil 40 driving contact;
and S20, the control module obtains whether the reason of the circuit breaker tripping is fault tripping or manual operation through a control analysis method according to the received contact position signal, the fault current signal and the driving contact signal, and feeds back a corresponding operation signal.
In the actual operation process, the control module 10 can accurately judge whether the breaker is a man or a fault reason only by receiving the position information of the contact (not identified) identified by the position sensing module 20, the fault current information detected by the current transformer module 30 and the action information of the trip coil 40, which is helpful for the staff to accurately take a coping scheme according to the feedback information. For example, if the operation is manual, a remote control switching-on measure cannot be taken, so that safety accidents are avoided, in addition, if the circuit breaker is switched off due to faults, a remote control switching-on operation can be tried, and if the circuit breaker is unsuccessful, a field fault can be eliminated by a detection personnel.
The feedback of the corresponding operation signal by the control module 10 is not limited to the feedback to the server, but also includes the direct field feedback by the display screen.
In a further preferred embodiment, the control module 10 is connected to a server and feeds back corresponding operating signals to the server. For example, the control module 10 connects to the server using the communication module 70, which is advantageous in that the server can determine whether the control module 10 is in the on state through the connection of the communication module 70; the method has excellent effect on the accurate elimination of the fault. In a preferred embodiment, the communication module 70 is a communication line, and in other embodiments, the communication module 70 may use WIFI or 4G connection, but the corresponding signal is easily interfered by electromagnetic waves.
Further, the operation signal includes: manual operation, remote control operation, fault protection tripping, manual control tripping, tripping test tripping and backup protection tripping.
Specifically, when the circuit breaker is opened through the handle in manual operation circuit breaker, the contact is changed to the energy storage position by the on-off position. When the control module 10 judges that a fault current occurs in the line through the current transformer module 30, the control module 10 drives the contact to change from the closing position to the tripping position through the tripping coil 40, so that the circuit breaker trips. When the remote control is operated to open the brake, a remote control signal is sent to the control module 10 through the communication module 70, and the control module 10 drives the contact to change from the closing position to the tripping position through the tripping coil 40, so that the circuit breaker is tripped. Maintenance personnel can send a signal to the tripping coil 40 through the control module 10 on site to drive the contact to change from a closing position to a tripping position, so that the circuit breaker is tripped. When instantaneous large current (more than 16-20 times of common current) appears, the current is extremely large, so that the fault can be quickly cut off. At this time, the magnetic trip module 50 directly drives the contacts to change from the on position to the off position, and the controller can detect the instantaneous large current signal through the current transformer module 30. When the circuit breaker is manually opened through the tripping test button 60, the operating mechanism is changed from the closing position to the tripping position.
The identification method carried out in the control module 10 refers in particular to the accompanying figure 2:
s21, the control module 10 detects the working state of the contact, and if the working state is energy storage, a manual operation signal is fed back to the server; if the working state is tripping, executing step S22;
s22, the control module 10 detects whether the trip coil 40 drives the contact to operate, if yes, execute step S23; if not, go to step S25;
s23, the control module 10 detects whether a remote control instruction of the server is received, if yes, a remote control operation signal is fed back to the server; if not, go to step S24;
s24, the control module 10 detects whether a first fault current signal of the current transformer module 30 is received, and if yes, feeds back a fault protection trip signal to the server; if not, feeding back a manual control brake-separating operation signal to the server;
s25, the control module 10 detects whether a second fault current signal of the current transformer module 30 is received, and if yes, feeds back a backup protection trip operation to the server; and if not, feeding back tripping test opening operation to the server.
In the specific operation process, when the controller of the circuit breaker detects that the contact is changed from the switching-on position to the energy storage position through the operating mechanism position sensing module 20, the circuit breaker can be determined to be manually switched off.
When the control module 10 detects that the contact is changed from the closing position to the releasing position through the position of the sensing module, the control module 10 further determines whether there is a driving action of the trip coil 40, if so, further determines whether the remote control operation is issued by the communication module 70, if not, determines that the remote control operation is a fault protection tripping action through the first fault current of the current transformer module 30, and if not, determines that the circuit breaker is opened in a manual operation controller mode. If the control module 10 does not detect the driving action of the trip coil 40, a second fault current signal is detected through the current transformer module 30, where the second fault current is an instantaneous large current signal, and it can be determined that the magnetic trip module 50 drives the contact to perform protection trip. If the second fault current signal does not exist, it is determined that the circuit breaker is manually tripped by manually operating the trip test button 60.
Example 2
The invention also provides a circuit breaker, which comprises a control module 10, a position sensing module 20, a current mutual inductance module 30, a trip coil 40 and a contact, wherein the position sensing module 20, the trip coil 40 and the current mutual inductance module 30 are respectively connected with the control module 10; the trip coil 40 is used for driving the contact; the position sensing module 20 is used for detecting the working state of the contact; the current transformer module 30 is used to detect fault currents in the circuit.
The circuit breaker preferably further comprises a magnetic trip module 50 and a trip test button 60, wherein the magnetic trip module 50 is used for detecting instantaneous high current in a circuit and driving the contact; the tripping experiment button is used for driving the contact.
The current transformer module 30 may measure the induced currents of the three phases of power, and send the measured induced currents to the control module 10, so that when the operation signal is fed back, the fault protection trip is displayed, and at the same time, which phase of circuit has a fault is fed back, which is more accurate for removing the fault.
The control module is preferably an MKM33 model processor.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (7)
1. A circuit breaker, comprising:
a contact having an operating state comprising: closing, storing energy and releasing;
a position sensing module: detecting the position of the contact;
the current mutual inductance module: detecting a fault current in the circuit;
a trip coil: driving the contact to work;
the control module is respectively connected with the position sensing module, the current mutual inductance module and the trip coil: the current transformer is used for receiving corresponding detection signals fed back by the position sensing module, the current transformer module and the trip coil, and feeding back an operation signal of a circuit breaker according to the corresponding detection signals, wherein the operation signal comprises: manual operation, fault protection tripping, manual control tripping, tripping test tripping, backup protection tripping and remote control operation; the control module is provided with a manual control unit and is also used for controlling the tripping coil to work;
the magnetic tripping device also comprises a magnetic tripping module and a tripping test button, wherein the magnetic tripping module is used for driving the contact to trip when instantaneous large current is detected to appear in the circuit; the tripping experiment button is used for driving the contact.
2. The circuit breaker of claim 1, further comprising a communication module through which the control module is connected to a server; the control module is also used for sending a breaker operation signal to the server and receiving a remote control instruction sent by the server.
3. The circuit breaker according to claim 2, characterized in that said operating signal comprises in particular:
manual operation: the breaker handle is manually operated to realize the opening of the breaker, and the working state of the contact is changed from the closing state to the energy storage state;
fault protection tripping: after the control module receives a fault current signal sent by the current mutual inductance module, the control module drives the contact to change the working state of the contact from the closed state to the tripped state through the tripping coil;
manually controlling the opening operation: the control module is directly operated manually, and the control module drives the working state of the contact to change from the closed state to the tripping position through the tripping coil;
tripping test opening operation: manually operating the tripping test button, wherein the tripping test button drives the working state of the contact to change from the closed state to the tripped state;
backup protection tripping: when the magnetic tripping module detects that instantaneous large current occurs in a circuit, the magnetic tripping module drives the contact to change the working state of the contact from the closed state to the tripping position;
remote control operation: the control module receives a remote control signal of the server, and the control module drives the working state of the contact to change from the closed state to the tripped state through the tripping coil.
4. A circuit breaker operation recognition method, characterized in that the circuit breaker of any one of claims 1 to 3 is used, comprising the steps of:
A. the control module receives the contact working state detected by the position sensing module, the fault current signal detected by the current mutual inductance module and the tripping coil driving contact signal;
B. and the control module obtains whether the reason of the circuit breaker tripping is fault tripping or manual operation by a control analysis method according to the received contact working state, the fault current signal and the driving contact signal, and feeds back a corresponding operation signal.
5. The circuit breaker operation recognition method according to claim 4, wherein the control analysis method in the step B specifically comprises:
b1, the control module detects the working state of the contact, and if the working state is energy storage, a manual operation signal is fed back; if the working state is tripping, executing the step B2;
b2, the control module detects whether a tripping coil drives the contact to act, if yes, the step B3 is executed; if not, go to step B5;
b3, the control module detects whether a remote control instruction of the server is received, if yes, a remote control operation signal is fed back; if not, go to step B4;
b4, the control module detects whether a first fault current signal of the current mutual inductance module is received, if yes, a fault protection tripping signal is fed back; if not, feeding back a manual control opening operation signal;
b5, the control module detects whether a second fault current signal of the current mutual inductance module is received, if yes, a backup protection tripping operation is fed back; if not, the tripping test opening operation is fed back.
6. The circuit breaker operation recognition method as claimed in claim 5, wherein said step B1 further comprises: and if the working state is closed, feeding back a normal working signal.
7. The circuit breaker operation recognition method according to claim 6, wherein the object to which the control module feeds back the operation information includes: server, local terminal display screen.
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| CN110850219B (en) * | 2019-11-28 | 2023-06-27 | 珠海格力电器股份有限公司 | Fault detection circuit, fault detection method and refrigerating equipment |
| TWI758972B (en) * | 2020-11-25 | 2022-03-21 | 台灣電力股份有限公司 | Power safety protection system |
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